To study for COMLEX-USA Level 1, build your foundation during your pre-clinical years, then run a focused six-to-eight-week dedicated period built around daily COMLEX-style practice questions, the NBOME COMLEX-USA Blueprint, and deliberate osteopathic manipulative medicine (OMM) review. Level 1 is pass/fail, and passing means reaching an overall standard score of 400. Your goal is not a number to brag about. It is a confident, comfortable pass that proves you have the osteopathic foundation Level 2-CE and your rotations will build on.
What COMLEX-USA Level 1 Tests in 2026
COMLEX-USA Level 1 is the first of the three-level licensing sequence for osteopathic (DO) medical students, administered by the National Board of Osteopathic Medical Examiners (NBOME). It assesses the foundational biomedical and osteopathic knowledge you need to move safely into supervised clinical training.
Two things about the exam changed recently, and both matter for how you prepare.
It is pass/fail. For administrations on or after May 10, 2022, NBOME eliminated the three-digit numeric score for Level 1 and now reports only Pass or Fail. Passing is based solely on reaching an overall standard score of 400 or higher. The standard is criterion-based: there is no fixed percentage of students who “must” fail.
The format is getting shorter in 2026. Effective May 2026, the total number of test items drops to 320 (down from 352), and the break structure is revised to give you more scheduled break opportunities. The exam is still delivered in two timed sessions of four hours each (eight hours of testing in total), using single-best-answer multiple-choice questions, with some newer items that include audio-visual components.
| Feature | COMLEX-USA Level 1 (2026) |
| Scoring | Pass / Fail (standard score of 400 to pass) |
| Total questions | 320 (effective May 2026; previously 352) |
| Sessions | Two 4-hour sessions (8 hours total) |
| Question format | Single-best-answer multiple choice plus select audio-visual items |
| Administered by | NBOME |
| Osteopathic content | Yes. OMM/OPP is unique to COMLEX |
You still receive a Formative Performance Profile that compares your total performance, and your performance in each content area, against other first-time test-takers who passed. Use it as diagnostic feedback, not a scoreboard.
What the Pass/Fail Era Changes About Your Strategy
A pass/fail Level 1 does not mean you can coast. It means you should redirect the energy you would have spent chasing a three-digit score toward two things: passing comfortably on the first attempt, and building durable knowledge for Level 2-CE and your clinical rotations, where performance still carries weight for residency.
Practically, that means:
- Aim for a comfortable margin, not the bare minimum. Students who target “just barely 400” leave no cushion for a bad test day. Build your prep so a passing result is never in doubt.
- Do not neglect OMM. Osteopathic principles and manipulative medicine are tested throughout Level 1, and they are the content DO students most often under-prepare because it is not on the USMLE. This is where a pass/fail exam can still trip you up.
- Treat Level 1 as the foundation for Level 2-CE. The organ-system and clinical reasoning you lock in now is the same material Level 2-CE tests at a higher clinical level. Learning it well once saves you a full re-learn later.
A Realistic COMLEX Level 1 Study Timeline
Most successful DO students prepare in two phases: a long, low-intensity foundation phase across the pre-clinical curriculum, then a shorter, high-intensity dedicated phase before test day.
Phase 1: Foundation (throughout your pre-clinical years). Learn each organ system and discipline well the first time, using video lectures and spaced review so material sticks. Start doing practice questions as you finish each block, not just during dedicated. Keep OMM active all year, because it fades fast if you only cram it at the end.
Phase 2: Dedicated (roughly six to eight weeks). This is where you convert knowledge into test performance.
| Week(s) | Focus |
| 1-2 | Diagnostic self-assessment (COMSAE); rebuild weak organ systems; begin a daily Qbank block |
| 3-5 | Systematic content review by system and discipline; increase daily questions; dedicated OMM review sessions |
| 6-7 | Timed, mixed practice blocks under exam conditions; drill wrong answers; second COMSAE to confirm readiness |
| 8 | Light targeted review, timed practice, rest before test day (no new material) |
Adjust the length to your baseline. A strong pre-clinical foundation may need only six weeks, while more review-heavy students may want eight. The constant across every good plan is daily practice questions with careful review of every wrong answer.
High-Yield Content and the OMM Difference
The single biggest strategic difference between COMLEX and the USMLE is osteopathic content. OMM and osteopathic principles and tenets (OPP) appear across the exam and reward students who practice them as their own discipline rather than an afterthought.
High-yield areas to prioritize:
- Osteopathic principles, OMM techniques, and their clinical application, including somatic dysfunction, viscerosomatic relationships, and when OMM is indicated. This is COMLEX-unique and frequently under-studied.
- Organ-system pathophysiology and pharmacology, the shared backbone with any preclinical licensing exam.
- Clinical presentations and first-step management, framed the way NBOME writes them.
The best way to anchor your review is the official COMLEX-USA Blueprint, which lays out exactly which competency domains and clinical presentations are in scope. Study to the Blueprint, not to a generic outline.
COMLEX vs. USMLE: Should You Take Both?
Many DO students also sit the USMLE to broaden their residency options, since some programs are more familiar with USMLE scoring. Whether that is right for you depends on your target specialty and programs. It is a real decision with real trade-offs, and we cover it in depth in our guide to COMLEX vs. USMLE for DO students. If you do take both, remember that COMLEX still requires the osteopathic content the USMLE never tests, so OMM review is non-negotiable.
The Best Resources for COMLEX Level 1
Combine official NBOME materials (for accuracy about the exam itself) with a strong content-and-question resource (for actually learning and drilling).
Official NBOME resources:
- COMLEX-USA Blueprint: the authoritative map of what Level 1 tests. Build your review around it.
- COMSAE (Comprehensive Osteopathic Medical Self-Assessment Examination): NBOME’s own self-assessment to gauge readiness before test day.
- WelCOM: a free NBOME self-assessment series on the CATALYST platform, with real-time answers and rationales.
Lecturio for COMLEX Level 1: Lecturio’s COMLEX Level 1 preparation pairs high-yield video lectures with a COMLEX-style Qbank so you learn the content and practice the exact reasoning the exam rewards. Crucially, it includes a dedicated Osteopathic Manipulative Medicine course with hands-on OMM technique tutorials, the COMLEX-unique material most students struggle to review well. You can study by subject or by organ system, whichever matches how your school teaches.
Start Your COMLEX Level 1 Prep with Lecturio
The students who pass COMLEX Level 1 comfortably are the ones who learned the content well the first time and practiced osteopathic reasoning all year, not just in the final weeks. Build your COMLEX Level 1 foundation with Lecturio: high-yield video lectures, a COMLEX-style Qbank, and a dedicated OMM course, all in one place.
Frequently Asked Questions
Is COMLEX Level 1 hard? It is a rigorous eight-hour exam, but it is designed to be passable with disciplined preparation. Because it is pass/fail, the goal is a confident pass rather than a top score, which lowers the pressure compared with the old numeric-score era, as long as you prepare properly and do not neglect OMM.
What is a passing score for COMLEX Level 1? Passing is based on an overall standard score of 400 or higher. You do not receive a numeric score on your transcript, only Pass or Fail, plus a Formative Performance Profile.
How long should I study for COMLEX Level 1? Most students use a dedicated period of about six to eight weeks on top of a solid pre-clinical foundation. Your ideal length depends on how strong that foundation is and your practice-question performance.
How many questions are on COMLEX Level 1? Effective May 2026, Level 1 has 320 questions (reduced from 352), delivered across two four-hour sessions.
Do I have to take the USMLE too? No. DO students are not required to take the USMLE. Many choose to for broader residency options, but it is optional and depends on your goals. See our COMLEX vs. USMLE guide to decide.
